Laser-Induced Breakdown Spectroscopy for Advanced Characterisation and Sorting of Steel Scrap LCS

AUTHOR/S:U. Chiarotti; V. Volponi PAPER PRESENTED TO: RFCS-CT-2006-00035


The use of laser induced breakdown spectroscopy (LIBS) for scrap analysis and sorting has been industrially evaluated in this project.


A LIBS prototype was developed and installed for scrap analysis at the output of an industrial shredder and at a conveyor belt exiting into an electrical arc furnace.


It was shown that the developed prototype is feasible to use in an industrial environment for robust automated chemical scrap analysis. For example, the online measurement of silicon content shows good agreement with slag and steel analysis of the melt.


Furthermore, sorting trials was carried out with a lab-scale LIBS sorting system to evaluate its sorting potential. The technique’s high capability to recover FeMn steels from a flow of stainless steel and also the ability to sort out objects containing copper from a ferrous iron flow was demonstrated. Expert systems for scrap classifications have been investigated and the algorithms show high fidelity for sorting applications.

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